World's Largest Penguin Colony Loses Its Crown Amid 'Alarming' Decline

A recent study has revealed an "alarming" decline in the chinstrap penguin population on Zavodovski Island, a remote volcanic island in the South Sandwich Islands. The island, once home to the world's largest chinstrap penguin colony, has lost over 680,000 individuals, representing nearly two-thirds of its chinstrap penguins, between 2011 and 2025. This significant reduction has caused the colony to lose its title, which now belongs to the Adelie penguins of Cape Adare in Antarctica's Ross Sea.

Researchers from the British Antarctic Survey, who published their findings in Current Biology, attribute this drastic decline primarily to climate-driven changes in the Southern Ocean. These changes are believed to be disrupting the penguins' food supply, particularly krill. The extent of the population collapse has prompted suggestions that chinstrap penguins may warrant reclassification from "least concern" to "endangered" on the International Union for Conservation of Nature's list of threatened species.